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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X
7.2.
CIRCUIT DESCRIPTION
7.2.1.
APFC Converter
This circuit corrects the input current in order to follow the sine-wave with pressurizing the rectified AC power to about 390V.
1) PFC output voltage is detected by R34-37, R41-R44, R87, R90 and R91 and is input to 1pin of IC24.
This signal also detects over voltage.
Input current is detected by R11, R16 and is input to 4pin of IC24.
This signal also detects over current.
The followed AC sine-wave voltage is detected by R6-8, R33, R38 and R39 and is input to 3pin of IC24.
IC24 operates PWM control of Q49 with those signals in order to control of APFC output voltage and to follow the sine-wave
of input current.
2) Over voltage protection
If over voltage is detected, IC24 stops its operation for protection.
3) Over current protection
Current is detected by R10, R11 and R50.
If over voltage is detected, IC24 stops its operation for protection.
4) IC24
Pin1 INV: Error amp inverting input
Pin2 COMP: Error amplifier output
Pin3 MULT: Multiplexer input
Pin4 CS: Current sense input
Pin5 ZCD: Zero current detection input
Pin6 GND: Ground
Pin7 GD: Gate drive pulse output
Pin8 Vcc: Input voltage
20
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Troubleshooting
